选择理论中两个结论的改进

The Improvement of Two Results in Selection Theory

中文关键词:  连续选择  可数序基

英文关键词:continuous selection  bases of countable order.

中文摘要:

      本文利用可数序基的概念，讨论了下半连续集值映射的选择问题，改进了选择理论中的两个经典结论．

英文摘要:

      In this paper, we prove the selection theorems of set valued mappings with valus in the space having bases of countable order, two famous results are improved.